A small word and a BIG difference

Actually all the solutions must be wrong!

You wonder why? Well... think about what "safe" actually means in chess. Or, even better, think about the difference between a "safe" pawn and a "covered" pawn.

And now ask yourself how a white pawn, or any other white piece on the board, can not be safe when there are no black pieces on the board...

Got it? :D